Recovery of lead and silver from zinc acid-leaching residue via a sulfation roasting and oxygen-rich chlorination leaching method

作     者：WANG Rui-xiang YANG Yu-dong LIU Cha-xiang ZHOU Jie FANG Zhuang YAN Kang TIAN Lei XU Zhi-feng 王瑞祥;杨裕东;刘茶香;周杰;方壮;严康;田磊;徐志峰

作者机构：School of Metallurgical and Chemical EngineeringJiangxi University of Science and TechnologyGanzhou 341000China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2020年第27卷第12期

页      面：3567-3580页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：Projects(51804136,52064021,52074136,51564021,52064022)supported by the National Natural Science Foundation of China Projects(2019T120625,2019M652276)supported by the China Postdoctoral Science Foundation Project(20202ACB213002)supported by the Jiangxi Province Science Fund for Distinguished Young Scholars,China Project(2019KY09)supported by the Program for Excellent Young Talents,JXUST Young Jinggang Scholars of Jiangxi Province,Merit-based Postdoctoral Research in Jiangxi Province,China Projects supported by the Distinguished Professor Program of Jinggang Scholars,Chinain Institutions of Higher Learning,Jiangxi Province,China 

主　　题：acid-leaching residue sulfation roasting chlorine salt Pb,Ag kinetics 

摘      要：A large amount of acid-leaching residue is produced during the conventional Zn hydrometallurgy process,and this residue has a large concentration of a variety of valuable *** purpose of this study was to evaluate the ability of a procedure that entails the use of sulfation roasting,water leaching,and chlorination leaching(blowing oxygen technique)to recover Pb and Ag,followed by cooling crystallization and the replacement of Ag with lead sheet,to realize the full recovery of all valuable metals from zinc acid-leaching residue;consequently,good results were *** best results were obtained under the following conditions:a sulfuric acid at 70%of the raw material quality,roasting temperature of 300°C and roasting time of 2 h,followed by the process of leaching the roasted residue for 1 h by applying a water-to-solid ratio of 5꞉1 at room *** recovery rates of Zn and Fe were 98.69%and 92.36%,*** main parameters of the chlorine salt leaching system were as follows:Cl−concentration of 300 g/L,Fe3+concentration of 25 g/L,acid concentration of 2 mol/L,liquid-to-solid ratio of 9 mL:1 g,temperature of 90℃,and leaching time of 0.5 h;this leaching process was followed by filtration *** conditions resulted in high extents of leaching for Pb and Ag(i.e.,98.87%and 96.74%,respectively).Finally,the kinetics of the process of Ag leaching using Cl−ions in an oxygen-rich medium was *** was found that the leaching process was controlled by the diffusion of the product layers,and the activation energy was 19.82 kJ/mol.